Tool holder



Aug. 2, C. F. RANDOLPH ET AL TooL HOLDER Filed 001' 24, 1923 l/VVENT RS I y Q E ATTORNEY Patented Aug. 2, 1927.

UNITED STATES v f1,e37 ,7s; PATENT OFFICE.

CLIFFORD r. RANDOLPH AND NICHOLAS MABCALUS, OFEPLAINFIELD, NEW JEBSEY, ASSIGNOBS 'ro NrLns-BEmENr-ro n COMPANY, on NEW Yon r, N. Y., A coarona T1027 OF NEW JERSEY.

TOQL HOLDER.

Application filed October 24, 1923. Serial no. 870,585.

This invention relates to tool holdersfor planers and like machines. In these machines, the tool is ordinarily clamped to the tool holder block by means of one or more 5 clamping plates secured by a plurality of clamping bolts. These clamping bolts must be loosened to change the tool and such operation requires considerable time and energy. One object of our invention is to provide an improved tool clamping means including a single operating element for readily clamp-,

in or releasing the tool relative to its holder. ifore specifically, it is an object ofthe mvention to provi e a tool clamping means '15 comprisin one or more rotary eccentric elements an a single operatin hand wheel for rotating the elements to 0 amp and unclamp the tool relative to its holder. Another object of the invention is to pro- 2 vide improved means for rotatably adjusting a tool holder block about its'pivot or swivel center and means for clamping the block in adjusted position both such means preferably being operated from a single hand wheel.

With .the above and other objects in view,

our invention consists in the features of con-' struction and operation set forth in the following specification and illustrated in the accompanying drawing. In such drawing annexed hereto and forming a part of this specification, we have shown'one embodiment of our invention but it will be understood that the invention can be otherwise embodied as and that the drawing is not to be construed as definin or limiting the scope of the invention, t e claims appended to this specification being relied upon for that purpose.

Referring to the figures of the drawing:

Figure 1 1s a side elevation of a tool ho der comprising the invention.

Fig. 2 is a front elevation thereof.

Fig. 3 is a vertical sectional view thereof on line 33 of Fig. 2.

Fig. 4 is a fragmentary view of Fig.3 but showing the mechanism illustrated in another position.

Fig. 5 is a cross section of the tool holder taken on line 5-5 of Fig. 3.

Fig. 6 is an enlarged fragmentary sectional view taken on line 6-6 of Fig. 2.

Referring more specifically to the drawing, 1 indicates a tool support or slide adapted to be mounted for vertical movement in a 55 saddle 2, the slide being provided with a r threaded shaft 10. A pinion 11 threadedliy;

bearin 3 for receiving the usual supporting and a j usting screw 4. This screw is adapt ed to be journaled in the bearing 3 and threadedly engage a nut 5 on the saddle. Mounted on a bolt 6' in the slide so that it may be swivelled thereon is a block 7. A- tool holder 8 is pivoted to this block at 9. The improvements comprising our invention are improved means for clamping the tool or tools in place in the holder 8 and improved means for adjusting the block 7 on its pivot 6 and for securin the block in its adjusted position. The etails of these mechanisms as illustrated in the drawing will now be described.

Rotatably supported in the slide 1 andprojecting forwardly therefrom is a screw mounted on this shaft is in mesh with rac teeth 12 on the block 7. A shaft 13 is ro-' tatably mounted in a forwardly extending portion 14 of the slide. An eccentric portion of this shaft engages against a plate 15 on the block 7 for clamping the block to the slide. A yoke 16 projects laterally from the shaft 13, and engages an annular groove 17 in the pinion. Keyed to the shaft 10 within the portion 14 of the slide is the hub of a hand wheel or capstan 18. A spring pressed detent 19 is adapted to hold. the wheel 18 in either of two positions axially. The inner end of the hub is provided with a tooth 20 for engaging with a cooperatin tooth 21 on the pinion as hereinafter descri ed.

The operation of the mechanism just described is as follows: As illustrated in Fig. 3. the'block 7 is clamped to the slide 1. When it is desired to ad ust the block about its pivot 6 the shaft 10 is rotated anti-clockwise. This operation drawsthe pinion 11 95 outwardly which rotates'the clamping shaft 13 and releases the block 7. When the pinion has been brought to the position shown in Fig. 4., the hub 18 is moved inwardly to engage its tooth 20 with the tooth 21 of the pinion. Rotation of the capstan will now rotate the pinion and screw as a unit and adjust the block about its axis 6. It will be noted that the pinion is never out of mesh with the rack teeth 12. When the block has been adjusted to the desired position, the hub 18 is withdrawn to the position shown in Fig. 3. Rotation of the capstan will now rotate only the screw. Rotation of the capstan and screw clockwise will op- 11'0 v 28 toward the tools.

erate to move the inion inwardly and rotate the clamping s aft 13 in a direction to clamp the block in its adjusted position, as shown in Fig. 3.

In the drawing, we have shown two tools 22 and 23 as supported in the tool holder 5, the tool 23 being positioned to cut deeper than the tool 22. In certain planing operaconsiderably less power and vibration than when using a single tool. It will be understood, however, that the tool holder illustrated is adapted to support one or a plurality of tools as may be desired.

The tool holder 8 is recessed at 24 for receiving the tools 22 and 23. A serrated plate 25 is preferably provided for backing up the tool 23. A spacer block 26 with a serrated plate 27 therein is provided between the two tools. Two blocks 28 are supported by bolts 29 forwardly of the tool 22, the forward face of each block being recessed to receive the eccentric portion of a clamping shaft 30 therein. A 5 ring 31 surrounding each bolt 29 serves to iiold each block 28 in contact with its eccentric.

One end of each shaft 30 has an arm 32 projecting laterally therefrom and respectively engaging nuts 33. One nut 33 is threaded to the right hand threads 34 of a shaft 35 and the other nut 33 is threaded to te left hand threads 36 of the shaft. The shaft is mounted for free axial movement in the tool holder and can be rotated by means of a handle element 37 In Fig. 3 the tools and mechanism just described are shown in the unclamped position. To clamp the tools in the holder, it is only necessary to rotate the hand wheel 37 anticlockwise. Such rotation -draws the nuts 33 together and swings the arms 32 toward each other. The eccentric shafts are thereb -rotated in a manner to firmly force the b ocks freely movable axially, the clamping effect of each shaft 30 operates direct y against the other shaft whereby the two shafts are operated with equal or balanced forces. The rear face of the serrated plate 27 is curved transversely whereby the same automatically adjusts itself to firmly gri both tools flatly between their holding p ates. the tools, it is only necessary to rotate the hand wheel 37. in a clockwise direction.

It will be understood that the tool holder or clapper box 8 is adapted to move outwerdly about its pivot 9 to prevent marring of the work on the idle or non-cutting stroke Since the shaft 35 is- To release of the work or tools. As illustrated in Fig. 3, a rojection 38 is preferably formed on the b ock 7 and recessed in a manner to recelve a projecting portion 39 of the tool holder The projection 39. is adapted to sw ng wlthin the projection 38 and these two pro ections are provided with enga ing surfaces at 40. The surfaces 40 there ore provide a metal to metal contact'which backs up the tool holder in a manner to relieve the pivot 9 from the load of upward thrust of the tools.

What we claim is: v 1. A tool holder comprising in combination, a, block adapted to receive a cutting tool therein, a plurality of rotary eccentrics operative a ainst the tool to clamp the same in the bloc and a unitary hand operated means for rotating the eccentrics.

2.'A tool holder comprising in combination, a block adapted to receive a cut-ting tool therein, a plurality of rotary eccentrics operative against the tool to clamp the same in the block, and a unitary screw threaded means for rotating the eccentrics.

3. A tool holder comprising in combination, a block adapted to receive a cutting tool therein, a pair of rotary eccentrics operative against the tool to clamp the same in the block, a shaft provided with right and left hand screw threads thereon, and a pair of 'nuts respectively connected to the said eccentrics and engaging the said screw threads.

4. A tool holder comprising in combination, a block adapted to receive a cutting tool therein, a pair of rotary eccentrics operative against the tool toclamp the same in the block, each eccentric'being provided with a laterally extendin arm, a, shaft provided with right and left and screw threads thereon, and a pair of nuts respectively engaging the said screw threads and connected to the free ends of the said arms, the shaft being mounted for free sliding movement no axiall whereby the eccentrics will be operate with balanced forces.

i 5. A tool holder comprisingin combination, a block adapted to receive a cutting tool therein, a plurality of rotary elements operative against the tool to clamp the same in the block, and a unitary hand operated means for rotating the elements.

6. A tool holder comprising in combination, a support, a tool holdin block piv- 12o otally mounted thereon, means %or adjusting the block about its pivot as a center, means for clamping the block in adjusted position, and a unitary hand operated means for operating the two first mentioned means.

7. A tool holder comprising in combination, a support, a tool holding block pivotally mounted thereon, a pinion for adjusting the block about its pivot as a center, pivoted means for clamping the block in 13 adjusted position, and a unita hand 0perated means for rotating the plnion to adjust the block and for moving the clamping means about its pivot to clamp the block.

8. A tool holder comprising in combination, a support, a tool holding block pivotally mounted thereon, a shaft mounted in the support, a pinion on the shaft engaging teeth in the block for adjusting the block about its pivot as a center means for clamping the block in adjusted position, and an operating element on the shaft for operating both the pinion and clamping means.

9. A tool holder comprising in combination, a support, a tool holdin block pivotally mounted thereon, a sha t mounted in the support, a pinion screw threadedlgmounted on the shaft and engaginv teet 20 in the block for adjusting the block about its pivot as a center, means connected to the pinion for clamping the block in adjusted position, and an operating element on the shaft for rotating the shaft and pinion.

10. A tool holder comprising in combination, a support, a tool holdin block pivottally mounted thereon, a sha t mounted in the support, a pinion screw threadedly mounted on the shaft and engaging teeth in the bloclg for adjusting the block about its pivot as a center, means connected to the pinion for clamping the block in ad- 'justed position, and means vfor rotating the shaft in the inion or for rotating the pinion an sha t as a unit.

In testimony whereof, we hereto afiix our signatures.

CLIFFORD F. RANDOLPH.

NICHOLAS MARCALUS. 

